On the FA, the crux was a grain battle on the summit. A fall in to the yucca/nolina/pointy thing at the base would have been a problem. Before the V grades, we thought this was about 5.10. Walling and Moffat on the FA, early 80's. Named after the "Tube" also known as the London Underground Railway. Moffat and that funny accent always pronounced it "chube" instead of the American version, "toob".

No need to jump off for the descent. You can downclimb low angle friction (5.7 ish) almost directly opposite the problem on a blunt arete type feature that leads down to an adjacent small boulder about 6' off the ground. The downclimb is worn and pretty obvious.